{
 "cells": [
  {
   "cell_type": "markdown",
   "id": "0864576a",
   "metadata": {},
   "source": [
    "# list练习"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "6a271574",
   "metadata": {},
   "source": [
    "## 上周回顾\n",
    ">*1.list的一般方法/函数的使用及案例，如：\n",
    "1.append()增加，增加list元素到list的末尾，常用于新建列表\n",
    "2.pop（index）/remove（value）对比两者的优势\n",
    "3.count（）查看某个元素的次数\n",
    "4.index（）查看某个元素第一次出现的位置\n",
    "5.exten（）两个list合并在一起，也可用[]+[]来实现\n",
    "6.sort()list元素的排序\n",
    ">*2. list的高级用法\n",
    "1.copy（）list（可变的数据类型）复制不等价于赋值，可用[:]\n",
    "2.enumerate()枚举，可同时遍历并获取index和valu"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "bf40dae1",
   "metadata": {},
   "source": [
    "本周内容："
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "id": "70df1919",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "i\n",
      "i\n",
      "a\n"
     ]
    }
   ],
   "source": [
    "vowels = [\"a\",\"e\",\"i\",\"o\",\"u\"]\n",
    "word = \"milliways\"\n",
    "# for letter in word:  # 检查word中出现的元音，并打印出来\n",
    "#第一个元素letter请不要和已有的变量重名\n",
    "# 第一个元素一般不命名，常用item（元素）来命名简写i\n",
    "# 第二个元素word（重要），意味着将遍历的内容\n",
    "# 遍历的内容一般是序列数据str /list\n",
    "for letter in word:\n",
    "    if letter in vowels: \n",
    "        print(letter)\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "id": "472a8598",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "i\n",
      "a\n"
     ]
    }
   ],
   "source": [
    "# 使用append（）新建列表\n",
    "vowels = [\"a\",\"e\",\"i\",\"o\",\"u\"]\n",
    "word = \"milliways\"\n",
    "found = []\n",
    "for letter in word:\n",
    "    if letter in vowels:# letter在元音字母表中\n",
    "        if letter not in found:# letter 不在found表中\n",
    "            found.append(letter)\n",
    "for vowels in found:\n",
    "        print(vowels)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "5379f669",
   "metadata": {},
   "source": [
    "```\n",
    "购物车程序项目：\n",
    "\n",
    "要求：1、运行程序后，让用户输入支付宝余额，然后打印我们的商品列表给用户。\n",
    "\n",
    "　　   2、让用户输入商品编号进行商品的购买。\n",
    "\n",
    "　　   3、用户选择商品后，检查用户的余额是否够，若够则直接扣款，不够则提醒用户。\n",
    "\n",
    "　　   4、用户可以随时退出购买，推出时打印用户已购买的商品和支付宝余额。\n",
    "```"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "acfcb8dd",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "请输入您的账户余额：200\n",
      "------------- good list ---------------\n",
      "商品编号： 0, 商品名称：纸巾, 商品价格：5元\n",
      "商品编号： 1, 商品名称：糖果, 商品价格：10元\n",
      "商品编号： 2, 商品名称：奶茶, 商品价格：15元\n",
      "商品编号： 3, 商品名称：电饭煲, 商品价格：350元\n",
      "请输入商品编号:1\n",
      "------------- good list ---------------\n",
      "商品编号： 0, 商品名称：纸巾, 商品价格：5元\n",
      "商品编号： 1, 商品名称：糖果, 商品价格：10元\n",
      "商品编号： 2, 商品名称：奶茶, 商品价格：15元\n",
      "商品编号： 3, 商品名称：电饭煲, 商品价格：350元\n"
     ]
    }
   ],
   "source": [
    "# 每个商品的内容是多个值的值，可选用list\n",
    "products = [[\"纸巾\", 5], [\"糖果\", 10], [\"奶茶\", 15], [\"电饭煲\", 350]]\n",
    "# 用户购物信息数据存放\n",
    "shopping_list = []\n",
    "# 用户输入余额信息\n",
    "balance = int(input(\"请输入您的账户余额：\"))\n",
    "# 打印商品信息\n",
    "# info = ''' ------------- good list ---------------\n",
    "# 商品编号： %s, 商品名称：%s, 商品价格：%s\n",
    "# 商品编号： %s, 商品名称：%s, 商品价格：%s\n",
    "# 商品编号： %s, 商品名称：%s, 商品价格：%s\n",
    "# 商品编号： %s, 商品名称：%s, 商品价格：%s\n",
    "# '''%(0,products[0][0],products[0][1],\n",
    "#      1,products[1][0],products[1][1],\n",
    "#      0,products[2][0],products[2][1],\n",
    "#      0,products[3][0],products[3][1],)\n",
    "# print(info)\n",
    "# list的长度？ len（）\n",
    "\n",
    "# 执行循环\n",
    "\n",
    "while True:\n",
    "    print('------------- good list ---------------')\n",
    "    for i in range(len(products)):\n",
    "        print(\"商品编号： %s, 商品名称：%s, 商品价格：%s元\" % (i, products[i][0], products[i][1]))\n",
    "    # 用户输入商品编号，实现查询\n",
    "    choice = input(\"请输入商品编号:\")  # input 输入的内容默认是字符串str，例如输入2，则显示“2”\n",
    "    if choice.isdigit():\n",
    "        # 判断编号是否存在\n",
    "        if int(choice) < len(products):\n",
    "            # 检查用户余额 > 商品价格\n",
    "            if balance > products[int(choice)][1]:\n",
    "                balance = balance - products[int(choice)][1]  # 用户余额发生变化，要扣除\n",
    "                shopping_list.append(products[int(choice)])\n",
    "                pass\n",
    "            else:\n",
    "                print(\"您的余额已不足，请更换其他支付方式\")\n",
    "            pass\n",
    "        else:\n",
    "            print(\"请输入正确的商品编号，您输入的商品不存在\")\n",
    "    elif choice == \"退出\":\n",
    "     # 打印用户余额和用户的商品列表信息\n",
    "     print(\"用户余额：%s,购物车：%s\" % (balance, shopping_list))\n",
    "     break\n",
    "    # for i in products:\n",
    "    #     print(\"编码：\",products.index(i),i)\n",
    "\n",
    "# shoppingcar = input(\"请输入选购商品的编码，加入购物车：\")\n",
    "# shopping_list.append()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "2dee948e",
   "metadata": {},
   "outputs": [],
   "source": []
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "Python 3",
   "language": "python",
   "name": "python3"
  },
  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 3
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython3",
   "version": "3.8.8"
  },
  "toc": {
   "base_numbering": 1,
   "nav_menu": {},
   "number_sections": true,
   "sideBar": true,
   "skip_h1_title": false,
   "title_cell": "Table of Contents",
   "title_sidebar": "Contents",
   "toc_cell": false,
   "toc_position": {},
   "toc_section_display": true,
   "toc_window_display": false
  },
  "varInspector": {
   "cols": {
    "lenName": 16,
    "lenType": 16,
    "lenVar": 40
   },
   "kernels_config": {
    "python": {
     "delete_cmd_postfix": "",
     "delete_cmd_prefix": "del ",
     "library": "var_list.py",
     "varRefreshCmd": "print(var_dic_list())"
    },
    "r": {
     "delete_cmd_postfix": ") ",
     "delete_cmd_prefix": "rm(",
     "library": "var_list.r",
     "varRefreshCmd": "cat(var_dic_list()) "
    }
   },
   "types_to_exclude": [
    "module",
    "function",
    "builtin_function_or_method",
    "instance",
    "_Feature"
   ],
   "window_display": false
  }
 },
 "nbformat": 4,
 "nbformat_minor": 5
}
